feat: before input

README.md

@@ -80,7 +80,7 @@ busted --lua nlua spec/mytest_spec.lua
 
 ## Inputs
 
-### `nvim_version`
+### `nvim_version` (optional)
 
 Version of Neovim to install. Valid values are `stable`, `nightly` or version tag such
 as `v0.9.2`. 
@@ -92,7 +92,7 @@ as `v0.9.2`.
 > This value must exactly match to a tag name 
 > when installing the specific version.
 
-### `luarocks_version`
+### `luarocks_version` (optional)
 
 Version of LuaRocks[^2] to install.
 
@@ -101,6 +101,12 @@ Version of LuaRocks[^2] to install.
 [^2]: This action uses [LuaRocks](https://luarocks.org/)
       to install `busted` and test dependencies.
 
+### `before` (optional)
+
+A bash script to run before running the tests.
+For example, you can use this to install additional luarocks packages
+that can't be installed automatically using `luarocks test`.
+
 ## Resources
 
 - [`nvim-lua/nvim-lua-plugin-template`](https://github.com/nvim-lua/nvim-lua-plugin-template/)

action.yml

@@ -14,9 +14,13 @@ inputs:
     required: false
     default: 'stable'
   luarocks_version:
-    description: 'Version of LuaRocks to install.'
+    description: Version of LuaRocks to install.
     required: false
     default: '3.11.1'
+  before:
+    description: Script to run before running tests.
+    required: false
+    default: ''
 runs:
   using: "composite"
   steps:
@@ -57,6 +61,11 @@ runs:
       with:
         luarocksVersion: ${{ inputs.luarocks_version }}
 
+    - name: Run 'before' script
+      if: ${{ inputs.before != '' }}
+      run: ${{ inputs.before }}
+      shell: bash
+
     - name: Install busted and nlua
       if: steps.cache-luarocks.outputs.cache-hit != 'true'
       run: |